Question: What did the Gregorian_calendar replace and what is it named after?
Paraphrase: Tell me what the Gregorian_calendar replaced and the person it was named after.
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q12138 wdt:P1365 ?ans_1 . wd:Q12138 wdt:P138 ?ans_2 }
Answer: Julian calendar, Gregory XIII